Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 28,968	$ 6,313
Restricted cash	10,000
Equity securities		47,082
Accounts receivable:
Oil, natural gas and natural gas liquids revenues	14,075	40,176
Other	1,322	4,496
Derivative asset	6,231	15,452
Other current assets	277	2,314
Total current assets	60,873	115,833
Oil and natural gas properties, net of accumulated depreciation, depletion and amortization; December 31, 2019, $15,066; December 31, 2018, $12,950	114,031	405,688
Assets held for sale	316
Long–term derivative asset		8,499
Other assets	4,965	4,474
Total assets	180,185	534,494
Current liabilities:
Accounts payable and accrued liabilities	23,524	26,146
Derivative liability		1,165
Other current liabilities	586
Total current liabilities	24,110	27,311
Asset retirement obligations	88,668	117,529
Liabilities held for sale	139
Long-term debt, net		115,000
Other long–term liabilities	1,770	1,036
Commitments and contingencies (Note 14)
Mezzanine equity	127	79
Stockholders’ equity:
Common stock – $0.01 par value; 65,000,000 shares authorized; 10,221,008 shares issued and 10,183,467 shares outstanding as of December 31, 2019; 10,054,816 shares issued and 10,042,468 shares outstanding as of December 31, 2018	102	100
Additional paid-in capital	180,177	249,717
Treasury stock at cost – 37,541 shares at December 31, 2019; 12,348 shares at December 31, 2018	(562)	(247)
Retained earnings (accumulated deficit)	(114,346)	23,969
Total stockholders’ equity	65,371	273,539
Total liabilities and equity	$ 180,185	$ 534,494